Express Node.js web server that forwards proxied cookies

proxycookie.js

var express = require('express'),
	proxy = require('http-proxy'),
	app = express.createServer();

var routingProxy = new proxy.RoutingProxy();
var apiHost = process.argv[2] ? process.argv[2] : 'my.api.com';
var apiPort = process.argv[3] ? process.argv[3] : '8080';
var apiPrefix = process.argv[4] ? process.argv[4] : '1.1';

function onApiProxyEnd(req, res, proxyHeaders) {
	if (proxyHeaders && 
		proxyHeaders.hasOwnProperty('set-cookie') &&
		Object.prototype.toString.apply(proxyHeaders['set-cookie']) === '[object Array]')
	{
		req.session.cookies = proxyHeaders['set-cookie'];
	}
}

function apiProxy(pattern, host, port) {
	var hasEndListener = false;

	return function(req, res, next) {
		if (req.url.match(pattern)) {
			if (req.session && req.session.cookies) {
				var cookies = req.session.cookies;
				var i = cookies.length;
				while (i--) {
					if (req.headers.cookie && req.headers.cookie.length > 0) {
						req.headers.cookie += ';';
					}
					req.headers.cookie += cookies[i];
				}
			}
			routingProxy.proxyRequest(req, res, {host: host, port: port});
			if (!hasEndListener) {
				routingProxy.proxies[host + ':' + port].on('end', onApiProxyEnd);
				hasEndListener = true;
			}
		} else {
			next();
		}
	}
}

app.configure(function () {
	app.use(express.cookieParser('secret'));
	app.use(express.session({secret: 'secret'}))
	app.use(apiProxy(new RegExp('\/' + apiPrefix + '\/.*'), apiHost, apiPort));
	app.use(express.methodOverride());
	app.use(express.bodyParser());
	app.use(express.static(__dirname));
	app.use(express.errorHandler({
		dumpExceptions: true, 
		showStack: true
	}));
	app.use(app.router);
});

app.listen(8000);

This gist seems outdated to say the least, still neat approach